1、 MIL-DTL-25bbb/b 999990b 2006323 Lbb I INCH-POUNDI MIL-DTL-2566616 (USAF) 15 September 1995 SUPERSEDMG 04 December 1980 MIL-C-27652D (USAF) DETAIL SPECIFICATION CONVERTER, LIQUID OXYGEN GCU-20/A This specification is approved for use by the Department of the Air Force and is available for use by all
2、 Departments and Agencies of the Department of Defense. I. SCOPE 1.1 Scope. This specification covers one type of converter. It provides storage and pressurization of 75 liters of liquid oxygen to 300 pounds per square inch gauge (psig), nominal pressure and does not include warming coils. The conve
3、rter is designated GCU-20/A. 2. APPLICABLE DOCUMENTS 2.1 General. The documents listed in this section are needed to meet the requirements specified in sections 3, 4, and 5 of this specification. This section does not include documents cited in other sections of this specification or recommended for
4、 additional information or as examples. While every effort has been made to ensure the completeness of this list, document users are cautioned that they must meet all specified requirements documents cited in sections 3,4, and 5 of this specification, whether or not they are listed. 2.2 Government d
5、ocuments. 2.2.1 Spec ifications. and standards. The following specifications and standards form a part of this document to the extent specified herein. Unless otherwise specified, the issues of these documents are those listed in the issue of the Department of Defense Index for Specifications and St
6、andards (DODISS) and supplement thereto, cited in the solicitation (see 6.2). SPECIFICATIONS DEPARTMENT OF DEFENSE MIL-V-9050 MIL-C-25516 MIL-DTL-25666 Valves, Oxygen, Pressure Relief, Aircraft Connectors, Electrical, Miniature, Coaxial, Environment Resistant Type, Converters, Liquid Oxygen, Capacit
7、ance Type Gauging, General Specification General Specification for For Beneficial comments (recommendations, additions, deletions) and any pertinent data which may be of use in improving this document should be addressed to: OC-ALUTICLA, 3001 Staff Drive, Tinker AFB, OK 73 145- 3037 by using the sel
8、f-addressed Standardization Document Improvement Proposal (DD Form 1426) appearing at the end of this document or by letter. AMSC NIA FSC 1660 DISTRIBUTION STATEMENT A. Approved for public release; distribution is unlimited. Provided by IHSNot for ResaleNo reproduction or networking permitted withou
9、t license from IHS-,-,- MIL-DTL-25bbb/b = 999990b 2Oi3bL24 OT2 m MIL-DTL-25666/6 STANDARD DEPARTMENT OF DEFENSE MIL-STD- 129 Marking for Shipment and Storage (Unless otherwise indicated, copies of the above specifications, and stanL-rds are available from the Standardization Documents Order Desk, Bu
10、ilding 4D, 700 Robbins Ave, Philadelphia, PA 191 1 1-5094) 2.3 Order of Precedence. In the event of a conflict between the text of this document and the references cited herein, the text of this document takes precedence. Nothing in this document, however, supersedes applicable laws and regulations
11、unless a specific exemption has been obtained. 3. REQUIREMENTS 3.1 qualification. The connectors furnished under this specification shall be products which are authorized by the qualifying activity for listing on the applicable qualified products list at the time set for opening of bids (see 4.2 and
12、 6.3). 3.2 Design and construction. The converter shall conform to figures 1 through 3. The converter shall have an operating pressure of 300 pounds per square inch gage (psig) and a minimum capacity of 75 liters of liquid oxygen measured at 1 atmosphere plus at least 3 percent of this volume to all
13、ow for the change in liquid density at the operating pressure, 3.2.1 Strength. The filled converter shall be designed to withstand the dynamic loads that are imposed by the following accelerations: Vertical down 9G Verticalup 3G Lateral 4G 3.2.2 Marking of ports. The ports shall be marked as indicat
14、ed in figure 2 3.2.3 Pressure relief valves. The pressure relief valves shall conform to types 111 and IV of MIL-V-9050 and shall be of such size and shape to fit the over-all dimensions specified for the converter. 3.2.4 Weight. The weight of the converter shall not exceed 80 pounds. 3.3 Performanc
15、e. 3.3.1 Final assembly pressure. The final assembly pressure of the converter shall be 320 psig. 3.3.2 Filling time. The time required to fill the converter shall not exceed 30 minutes. 3.3.3 Evaporation loss. 3.3.3.1 Vented condition. The evaporation loss of the essentially full converter in the v
16、ent condition shall not exceed 9 pounds. 3.3.3.2 Buildup condition. The evaporation loss of the essentially full converter in the buildup condition shall not exceed 5 pounds. 2 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MlL-DTL-25666/6 3.3.4 Bui
17、ldup time. The time required for the converter to reach its operating pressure immediately after it has been filled shall not exceed 15 minutes. 3.3.5 Capacitance. The capacitance of the sensing element, after it is installed in the empty converter, shall be 9 i 0.0 i7.5 picofarad (pf). 3.3.6 Inner
18、vessel pressure. 3.3.6.1 Inner vessel. The inner vessel shall meet the performance requirements for the inner vessel pressure test specified in MIL-DTL-25666 when subjected to a pressure of 500 psig. 3.3.6.2 Permanent volumetric expansion. The converter shall meet the performance requirements for pe
19、rmanent volumetric expansion as specified in MIL-DTL-25666 when subjected to a pneumatic or hydrostatic pressure of 500 psig . 3 3.7 Delivery rate. 3.3.7.1 Constant flow. The converter shall deliver a flow of gaseous oxygen up to 400 liters per minute for not less than 2.25 hours with the operating
20、pressure remaining between 295 and 3 15 psig after the first 15 minutes of flow. An intermittent increase or decrease of pressure by an additional 5 psig is allowable, but these variations shall not exceed a 2-minute interval for any one pressure cycle. The flow at the specified rate shall be initia
21、ted within 10 minutes after the converter has reached the operating pressure. The full test procedure is specified in MIL-DTL- 25666. 3.3.8 Calibration. The capacitance sensing element shall have characteristics that provide for a linear relationship between electrical capacitance and volume of liqu
22、id oxygen sensed. The relationship shall be in accordance with figure 4, using the equations that are specified (see 3.3.8.1) to determine tolerances. An example of the use of these equations is as follows: If the actual quantity of liquid oxygen at the 30-liter test point is 30.2 liters, the measur
23、ed capacitance must be between C maximum and C minimum. C minimum = 5.725 x 30.2 + 900.6 = 1073.5 pf C maximum = 5.875 x 30.2 + 919.4 = 1096.8 pf 3.3.8.1 Equations. The following equations shall be used to calculate the maximum and the minimum capacitances. Values less than 15 liters Values greater
24、than 15 liters C minimum = 5.6L + 902.5 C maximum = 6L + 91 7.5 C minimum = 5.725L + 900.6 C maximum = 5.875L + 9 19.4 C = Capacitance in pf L = Exact quantity in liters of liquid at test point 3.3.9 Operatinp temperature. The operating pressure shall remain between 295 and 320 psig after the first
25、15 minutes of flow at the low temperature and shall remain between 290 and 3 15 psig after the first 15 minutes of flow at the high temperature. An intermittent increase or decrease of pressure by an additional 5 psig is allowable provided these variances do not exceed a 2-minute interval for any on
26、e pressure cycle. 3.3.10 Vibration. 3.3. IO. 1 Vibration. There shall be no evidence of damage to the converter as a result of these tests. 3 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-25bbb/b 990b 200bL26 975 MIL-DTL-25666/6 3.3.10.2 Vi
27、bration - resonance. The converter shall not exhibit physical evidence of damage after completion of the resonance portion of the vibration test specified in MIL-DTL-25666. 3.3.10.3 Vibration - cycling. The converter shall not exhibit physical evidence of damage after completion of the cycling porti
28、on of the vibration test specified (see 4.4.1). 4. VERIFICATION 4.1 Classification of inspections. The inspection requirements specified herein are classified as follows: a. Qualification inspection (see 4.2). b. Conformance inspection (see 4.3). 4.2 Qualification inspection. The qualification inspe
29、ction shall consist of all the inspection methods specified in MIL-DTL-25666. 4.3 Conformance inspection. The conformance inspection shall consist of the individual tests and the sampling plans and tests specified in MIL-DTL-25666. 4.4 Vibration. 4.4.1 Vibration - cycling. The converter shall be vib
30、rated under the cycling conditions specified herein for the applicable periods listed in table i. The frequency shall be cycled between 5 to 500 cps or as specified in the applicable associated specification and return in a 15 minute cycle at an applied double amplitude of 0.036 inch or an applied a
31、cceleration of +10G which ever is the lower G value. The rate of change of frequency shall be logarithmic (see 3.3.10.3). 5. PACKAGING 5.1 Packaging. Packaging requirements shall be as specified in the contract or order (see 6.2). 5.2 Marking. Unless otherwise specified (see 6.2), marking shall be i
32、n accordance with MIL-STD-129. 6. NOTES (This section contains information of a general or explanatory nature that may be helpful, but is not mandatory.) 6.1 Intended us%. The 75 liter, 300 psig converter covered by this specification is intended to be used in the C- 5, C- 14 1, E-3 and E-4 aircraft
33、. 62 Acquisition requirements. Acquisition documents must spec$ the following: (a) Title, number, and date of this specification b. Issue of DODISS to be cited in the solicitation, and if required, the specific issue of individual documents referenced (see 2. i). 4 Provided by IHSNot for ResaleNo re
34、production or networking permitted without license from IHS-,-,- - NIL-DTL-25666/6 7999906 2006327 BOL MIL-DTL-25666/6 6.3 Oualification. With respect to products requiring qualification, awards will be made only for products which are, at the time of award of contract, qualified for inclusion in Qu
35、alified Products List QPL-25666 whether or not such products have actually been so listed by that date. The attention of the contractors is called to these requirements, and manufacturers are urged to arrange to have the products that they propose to offer to the Federal Government tested for qualif
36、ication in order that they may be eligible to be awarded contracts or purchase orders for the products covered by this specification. Information pertaining to qualification of products may be obtained from, OC-ALUTICLA, 3001 Staff Drive, Tinker AFB, OK 73 145-3037. 6.4 Subiect term !key word) listi
37、ng. Breathing oxygen Capacitance Container, inner Container, outer Delivery rate Dewar Element, sensing Evaporation loss Gunfire Life support LOX Valve, fi Il-bu i ldup-vent Valve, pressure closing Valve, pressure relief Vibration 6.5 Changes from Drevious issue. Asterisks are not used in this revis
38、ion to identify changes with respect to the previous issue, due to the extensiveness of the changes. 5 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-999990b 2006128 748 W MI L-DTL-2566616 TABLE i. curve for con verter vibrw O io0 200 300 500 Freque
39、ncy, CPS 6 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-25bbb/b 9999906 2006329 684 W MIL-DTL-25666/6 11-3/4 SPHERICAL RADIUS DIMENSIONS IN INCHES TOLERANCES : FRACTIONS f 1/64 FIGURE 1. Ernnt vie W 7 Provided by IHSNot for ResaleNo reprod
40、uction or networking permitted without license from IHS-,-,- MIL-DTL-Z5bbb/b 77Ob 2006330 3Tb m MIL-DTL-2566616 UIiLEsS OTHERWISE SPECIFIED, DIMENSIONS IN INCHES FIGURE 2. Bottom view 8 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-MIL-DTL-25bbb/b
41、979770b 2006L3L 232 MIL-DTL-2566616 VENT PRESSURE RELIEF I BUILDUP CONNECTION A GAS CONNECTION TO SUPPLY TO FILLER VALVE VALVE I PRESSURE CLOSING LIQUID CHECK VALVE CONNECTIONS FIGURE 3. Schematic diaeram 9 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS
42、-,-,-flIL-DTL-Z5bbb/b = 9999906 200b132 179 = MI L-DTL-2566616 - 60 75 O 15 30 45 60 75 QUANTITY OF LIQUID OXYGEN (LITERS) 1258.0 1345.0 TYPICAL TEST POINT 44.8 45.2 c MAXIMUM C NOMINAL 1451 fi rC MINIMUM . / L1171.0 pF U RANGE FOR TYPICAL TEST POINT I Liauid oxwen (liters) I Nominal capacitance (pf
43、) I 15 1 997.0 I I I 30 I 1084.0 I I- - 45 1 1171.0 I FIGURE 4. Relationship between capacitance and volume of oxvgen sensed IO Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-. Custodian: Air Force - 99 MIL-DTL-Z5bbb/h 9999906 2006333 005 W MIL-DTL-25666/6 Preparing activiy: Air Force - 7 1 Agent: Air Force - 99 Project 1660-F685 Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
